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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">hough_lines</span><span data-if="c" style="display:none;">T_hough_lines</span><span data-if="cpp" style="display:none;">HoughLines</span><span data-if="dotnet" style="display:none;">HoughLines</span><span data-if="python" style="display:none;">hough_lines</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">hough_lines</span><span data-if="c" style="display:none;">T_hough_lines</span><span data-if="cpp" style="display:none;">HoughLines</span><span data-if="dotnet" style="display:none;">HoughLines</span><span data-if="python" style="display:none;">hough_lines</span></code> — Detect lines in edge images with the help of the Hough transform and
returns it in HNF.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>hough_lines</b>(<a href="#RegionIn"><i>RegionIn</i></a> :  : <a href="#AngleResolution"><i>AngleResolution</i></a>, <a href="#Threshold"><i>Threshold</i></a>, <a href="#AngleGap"><i>AngleGap</i></a>, <a href="#DistGap"><i>DistGap</i></a> : <a href="#Angle"><i>Angle</i></a>, <a href="#Dist"><i>Dist</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>T_hough_lines</b>(const Hobject <a href="#RegionIn"><i>RegionIn</i></a>, const Htuple <a href="#AngleResolution"><i>AngleResolution</i></a>, const Htuple <a href="#Threshold"><i>Threshold</i></a>, const Htuple <a href="#AngleGap"><i>AngleGap</i></a>, const Htuple <a href="#DistGap"><i>DistGap</i></a>, Htuple* <a href="#Angle"><i>Angle</i></a>, Htuple* <a href="#Dist"><i>Dist</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>HoughLines</b>(const HObject&amp; <a href="#RegionIn"><i>RegionIn</i></a>, const HTuple&amp; <a href="#AngleResolution"><i>AngleResolution</i></a>, const HTuple&amp; <a href="#Threshold"><i>Threshold</i></a>, const HTuple&amp; <a href="#AngleGap"><i>AngleGap</i></a>, const HTuple&amp; <a href="#DistGap"><i>DistGap</i></a>, HTuple* <a href="#Angle"><i>Angle</i></a>, HTuple* <a href="#Dist"><i>Dist</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HRegion.html">HRegion</a>::<b>HoughLines</b>(Hlong <a href="#AngleResolution"><i>AngleResolution</i></a>, Hlong <a href="#Threshold"><i>Threshold</i></a>, Hlong <a href="#AngleGap"><i>AngleGap</i></a>, Hlong <a href="#DistGap"><i>DistGap</i></a>, HTuple* <a href="#Dist"><i>Dist</i></a>) const</code></p>
</div>
<div data-if="com" style="display:none;"></div>
<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>HoughLines</b>(<a href="HObject.html">HObject</a> <a href="#RegionIn"><i>regionIn</i></a>, <a href="HTuple.html">HTuple</a> <a href="#AngleResolution"><i>angleResolution</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Threshold"><i>threshold</i></a>, <a href="HTuple.html">HTuple</a> <a href="#AngleGap"><i>angleGap</i></a>, <a href="HTuple.html">HTuple</a> <a href="#DistGap"><i>distGap</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Angle"><i>angle</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Dist"><i>dist</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HRegion.html">HRegion</a>.<b>HoughLines</b>(int <a href="#AngleResolution"><i>angleResolution</i></a>, int <a href="#Threshold"><i>threshold</i></a>, int <a href="#AngleGap"><i>angleGap</i></a>, int <a href="#DistGap"><i>distGap</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Dist"><i>dist</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>hough_lines</b>(<a href="#RegionIn"><i>region_in</i></a>: HObject, <a href="#AngleResolution"><i>angle_resolution</i></a>: int, <a href="#Threshold"><i>threshold</i></a>: int, <a href="#AngleGap"><i>angle_gap</i></a>: int, <a href="#DistGap"><i>dist_gap</i></a>: int) -&gt; Tuple[Sequence[float], Sequence[float]]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p>该算子 <code><span data-if="hdevelop" style="display:inline">hough_lines</span><span data-if="c" style="display:none">hough_lines</span><span data-if="cpp" style="display:none">HoughLines</span><span data-if="com" style="display:none">HoughLines</span><span data-if="dotnet" style="display:none">HoughLines</span><span data-if="python" style="display:none">hough_lines</span></code> allows the selection of linelike
structures in a region, whereby it is not necessary that the individual
points of a line are connected. This process is based on the Hough transform.
</p>
<p>The parameter <a href="#AngleResolution"><i><code><span data-if="hdevelop" style="display:inline">AngleResolution</span><span data-if="c" style="display:none">AngleResolution</span><span data-if="cpp" style="display:none">AngleResolution</span><span data-if="com" style="display:none">AngleResolution</span><span data-if="dotnet" style="display:none">angleResolution</span><span data-if="python" style="display:none">angle_resolution</span></code></i></a> defines the degree of exactness
concerning the determination of the angles. It amounts to 1 /
<a href="#AngleResolution"><i><code><span data-if="hdevelop" style="display:inline">AngleResolution</span><span data-if="c" style="display:none">AngleResolution</span><span data-if="cpp" style="display:none">AngleResolution</span><span data-if="com" style="display:none">AngleResolution</span><span data-if="dotnet" style="display:none">angleResolution</span><span data-if="python" style="display:none">angle_resolution</span></code></i></a> degree.
The parameter <a href="#Threshold"><i><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></i></a>
determines by how many points of the original region a line's hypothesis
must at least be supported in order to be selected into the output.
The parameters <a href="#AngleGap"><i><code><span data-if="hdevelop" style="display:inline">AngleGap</span><span data-if="c" style="display:none">AngleGap</span><span data-if="cpp" style="display:none">AngleGap</span><span data-if="com" style="display:none">AngleGap</span><span data-if="dotnet" style="display:none">angleGap</span><span data-if="python" style="display:none">angle_gap</span></code></i></a> and <a href="#DistGap"><i><code><span data-if="hdevelop" style="display:inline">DistGap</span><span data-if="c" style="display:none">DistGap</span><span data-if="cpp" style="display:none">DistGap</span><span data-if="com" style="display:none">DistGap</span><span data-if="dotnet" style="display:none">distGap</span><span data-if="python" style="display:none">dist_gap</span></code></i></a> define a
neighborhood of the points in the Hough image in order to determine the
local maxima: <a href="#AngleGap"><i><code><span data-if="hdevelop" style="display:inline">AngleGap</span><span data-if="c" style="display:none">AngleGap</span><span data-if="cpp" style="display:none">AngleGap</span><span data-if="com" style="display:none">AngleGap</span><span data-if="dotnet" style="display:none">angleGap</span><span data-if="python" style="display:none">angle_gap</span></code></i></a> describes the minimum distance of two
maxima in the Hough image in angle direction and <a href="#DistGap"><i><code><span data-if="hdevelop" style="display:inline">DistGap</span><span data-if="c" style="display:none">DistGap</span><span data-if="cpp" style="display:none">DistGap</span><span data-if="com" style="display:none">DistGap</span><span data-if="dotnet" style="display:none">distGap</span><span data-if="python" style="display:none">dist_gap</span></code></i></a> in
distance direction, respectively. Thus, maxima exceeding
<a href="#Threshold"><i><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></i></a> but lying close to an even higher maximum are eliminated.
If multiple maxima in this neighborhood are equally high, all of them are
returned. This elimination can particularly be helpful when searching for
short and long lines simultaneously.
The lines are returned in Hessian Normal Form (HNF), that is by the direction
<a href="#Angle"><i><code><span data-if="hdevelop" style="display:inline">Angle</span><span data-if="c" style="display:none">Angle</span><span data-if="cpp" style="display:none">Angle</span><span data-if="com" style="display:none">Angle</span><span data-if="dotnet" style="display:none">angle</span><span data-if="python" style="display:none">angle</span></code></i></a> and length <a href="#Dist"><i><code><span data-if="hdevelop" style="display:inline">Dist</span><span data-if="c" style="display:none">Dist</span><span data-if="cpp" style="display:none">Dist</span><span data-if="com" style="display:none">Dist</span><span data-if="dotnet" style="display:none">dist</span><span data-if="python" style="display:none">dist</span></code></i></a> of their normal vectors.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  <li>未经并行化处理。</li>
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="RegionIn" class="parname"><b><code><span data-if="hdevelop" style="display:inline">RegionIn</span><span data-if="c" style="display:none">RegionIn</span><span data-if="cpp" style="display:none">RegionIn</span><span data-if="com" style="display:none">RegionIn</span><span data-if="dotnet" style="display:none">regionIn</span><span data-if="python" style="display:none">region_in</span></code></b> (input_object)  </span><span>region <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="c" style="display:none">Hobject</span></span>
</div>
<p class="pardesc">Binary edge image in which the lines are to be
detected.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="AngleResolution" class="parname"><b><code><span data-if="hdevelop" style="display:inline">AngleResolution</span><span data-if="c" style="display:none">AngleResolution</span><span data-if="cpp" style="display:none">AngleResolution</span><span data-if="com" style="display:none">AngleResolution</span><span data-if="dotnet" style="display:none">angleResolution</span><span data-if="python" style="display:none">angle_resolution</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Adjusting the resolution in the angle area.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>4</p>
<p class="pardesc"><span class="parcat">List of values:
      </span>1, 2, 4, 8</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Threshold" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Threshold value in the Hough image.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>100</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>2
          ≤
        
    <span data-if="hdevelop" style="display:inline">Threshold</span>
    <span data-if="c" style="display:none">Threshold</span>
    <span data-if="cpp" style="display:none">Threshold</span>
    <span data-if="com" style="display:none">Threshold</span>
    <span data-if="dotnet" style="display:none">threshold</span>
    <span data-if="python" style="display:none">threshold</span>
    </code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="AngleGap" class="parname"><b><code><span data-if="hdevelop" style="display:inline">AngleGap</span><span data-if="c" style="display:none">AngleGap</span><span data-if="cpp" style="display:none">AngleGap</span><span data-if="com" style="display:none">AngleGap</span><span data-if="dotnet" style="display:none">angleGap</span><span data-if="python" style="display:none">angle_gap</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Minimal distance of two maxima in the Hough image
(direction: angle).</p>
<p class="pardesc"><span class="parcat">Default:
      </span>5</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">AngleGap</span>
    <span data-if="c" style="display:none">AngleGap</span>
    <span data-if="cpp" style="display:none">AngleGap</span>
    <span data-if="com" style="display:none">AngleGap</span>
    <span data-if="dotnet" style="display:none">angleGap</span>
    <span data-if="python" style="display:none">angle_gap</span>
    </code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="DistGap" class="parname"><b><code><span data-if="hdevelop" style="display:inline">DistGap</span><span data-if="c" style="display:none">DistGap</span><span data-if="cpp" style="display:none">DistGap</span><span data-if="com" style="display:none">DistGap</span><span data-if="dotnet" style="display:none">distGap</span><span data-if="python" style="display:none">dist_gap</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Minimal distance of two maxima in the Hough image
(direction: distance).</p>
<p class="pardesc"><span class="parcat">Default:
      </span>5</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">DistGap</span>
    <span data-if="c" style="display:none">DistGap</span>
    <span data-if="cpp" style="display:none">DistGap</span>
    <span data-if="com" style="display:none">DistGap</span>
    <span data-if="dotnet" style="display:none">distGap</span>
    <span data-if="python" style="display:none">dist_gap</span>
    </code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Angle" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Angle</span><span data-if="c" style="display:none">Angle</span><span data-if="cpp" style="display:none">Angle</span><span data-if="com" style="display:none">Angle</span><span data-if="dotnet" style="display:none">angle</span><span data-if="python" style="display:none">angle</span></code></b> (output_control)  </span><span>hesseline.angle.rad-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Angles (in radians) of the detected lines' normal
vectors.</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>-1.5707963
          ≤
        
    <span data-if="hdevelop" style="display:inline">Angle</span>
    <span data-if="c" style="display:none">Angle</span>
    <span data-if="cpp" style="display:none">Angle</span>
    <span data-if="com" style="display:none">Angle</span>
    <span data-if="dotnet" style="display:none">angle</span>
    <span data-if="python" style="display:none">angle</span>
    
          ≤
          3.1415927</code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Dist" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Dist</span><span data-if="c" style="display:none">Dist</span><span data-if="cpp" style="display:none">Dist</span><span data-if="com" style="display:none">Dist</span><span data-if="dotnet" style="display:none">dist</span><span data-if="python" style="display:none">dist</span></code></b> (output_control)  </span><span>hesseline.distance-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Distance of the detected lines from the origin.</p>
<p class="pardesc"><span class="parcat">Number of elements:
      </span>Dist == Angle</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">Dist</span>
    <span data-if="c" style="display:none">Dist</span>
    <span data-if="cpp" style="display:none">Dist</span>
    <span data-if="com" style="display:none">Dist</span>
    <span data-if="dotnet" style="display:none">dist</span>
    <span data-if="python" style="display:none">dist</span>
    </code></p>
</div>
<h2 id="sec_result">结果</h2>
<p>该算子 <code><span data-if="hdevelop" style="display:inline">hough_lines</span><span data-if="c" style="display:none">hough_lines</span><span data-if="cpp" style="display:none">HoughLines</span><span data-if="com" style="display:none">HoughLines</span><span data-if="dotnet" style="display:none">HoughLines</span><span data-if="python" style="display:none">hough_lines</span></code> 返回值 <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
    
if the input is not empty.
The behavior in case of empty input (no input regions available) is
set via 该算子 <a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system('no_object_result',&lt;Result&gt;)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>,
the behavior in case of empty region is set via
<a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system('empty_region_result',&lt;Result&gt;)</span><span data-if="c" style="display:none">set_system("empty_region_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("empty_region_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("empty_region_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("empty_region_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("empty_region_result",&lt;Result&gt;)</span></code></a>.
If necessary an exception is raised.</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="threshold.html"><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></a></code>, 
<code><a href="skeleton.html"><span data-if="hdevelop" style="display:inline">skeleton</span><span data-if="c" style="display:none">skeleton</span><span data-if="cpp" style="display:none">Skeleton</span><span data-if="com" style="display:none">Skeleton</span><span data-if="dotnet" style="display:none">Skeleton</span><span data-if="python" style="display:none">skeleton</span></a></code>
</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="select_matching_lines.html"><span data-if="hdevelop" style="display:inline">select_matching_lines</span><span data-if="c" style="display:none">select_matching_lines</span><span data-if="cpp" style="display:none">SelectMatchingLines</span><span data-if="com" style="display:none">SelectMatchingLines</span><span data-if="dotnet" style="display:none">SelectMatchingLines</span><span data-if="python" style="display:none">select_matching_lines</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="hough_line_trans.html"><span data-if="hdevelop" style="display:inline">hough_line_trans</span><span data-if="c" style="display:none">hough_line_trans</span><span data-if="cpp" style="display:none">HoughLineTrans</span><span data-if="com" style="display:none">HoughLineTrans</span><span data-if="dotnet" style="display:none">HoughLineTrans</span><span data-if="python" style="display:none">hough_line_trans</span></a></code>, 
<code><a href="gen_region_hline.html"><span data-if="hdevelop" style="display:inline">gen_region_hline</span><span data-if="c" style="display:none">gen_region_hline</span><span data-if="cpp" style="display:none">GenRegionHline</span><span data-if="com" style="display:none">GenRegionHline</span><span data-if="dotnet" style="display:none">GenRegionHline</span><span data-if="python" style="display:none">gen_region_hline</span></a></code>, 
<code><a href="hough_circles.html"><span data-if="hdevelop" style="display:inline">hough_circles</span><span data-if="c" style="display:none">hough_circles</span><span data-if="cpp" style="display:none">HoughCircles</span><span data-if="com" style="display:none">HoughCircles</span><span data-if="dotnet" style="display:none">HoughCircles</span><span data-if="python" style="display:none">hough_circles</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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